docs: def set(
          self,
          x: int,
          y: int,
          back_r: int,
          back_g: int,
          back_b: int,
          fore_r: int,
          fore_g: int,
          fore_b: int,
          char: str,
      ) -> None:
          """Set the background color, foreground color and character of one cell.
  
          Args:
              x (int): X position to change.
              y (int): Y position to change.
              back_r (int): Red background color, from 0 to 255.
              back_g (int): Green background color, from 0 to 255.
              back_b (int): Blue background color, from 0 to 255.
              fore_r (int): Red foreground color, from 0 to 255.
              fore_g (int): Green foreground color, from 0 to 255.
              fore_b (int): Blue foreground color, from 0 to 255.
              char (AnyStr): A single character str or bytes object.
          """
          i = self.width * y + x
          self.back_r[i] = back_r
          self.back_g[i] = back_g
          self.back_b[i] = back_b
          self.fore_r[i] = fore_r
          self.fore_g[i] = fore_g
          self.fore_b[i] = fore_b
          self.char[i] = ord(char)